This is how many sprites will appear at each power level. So currently, 100 sprites at level 1 and 500 sprites at level 9.

Changes are preceded by #**** ccoa ****, so if it's too heavy (or too light), then you can find them to fiddle with them. Hope that helped!
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1. If you want too let the rain fall straight...

Look at this code:

Code:

if @type == 1
sprite.x -= 2
sprite.y += 16
sprite.opacity -= 8
end

remove the line changing the x coordinates of the rain, like so:

Code:

if @type == 1
sprite.y += 16
sprite.opacity -= 8
end

And the rain should fall straight down.

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2.Example how too created NEW weathers or make others different...

Where intensity is a number from 0 to 9 (0 is no weather), and transition_time is the transition, in frames, between the current weather and the new weather.
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Now, to mix weather effect, you'll need to set it up so that some of the sprites' bitmaps are set to one type, and one to another. To make mixed rain and snow, for example, add a new case to the switch statement, and edit it like so: